I've been using one of the prototype versions for a while now too. Some may have seen me with it at the sniper's hide cup this year. Its a straight forward and simple solution for complex stages. Or in the case of shc. I used my pre shoot time to map out all 4 stages on the board to take away some of that clock pressure.

Works great with dry erase or wet erase, markers or a grease pencil. I use the wet erase when its dry out and a grease pencil if there's precipitation involved that day.

Works well, simple, and doesn't go anywhere in the wind.